Fix typos and markdown (#2388)

* Fix typos

* Align properly

* Update core/consensus/slots/src/lib.rs

Co-Authored-By: cmichi <mich@elmueller.net>

* Update core/network/src/test/mod.rs

Co-Authored-By: cmichi <mich@elmueller.net>

* Update core/finality-grandpa/src/communication/mod.rs

Co-Authored-By: cmichi <mich@elmueller.net>

* Update core/consensus/common/src/import_queue.rs

Co-Authored-By: cmichi <mich@elmueller.net>

substrate/core/state-machine/src/changes_trie/changes_iterator.rs

@@ -228,7 +228,7 @@ impl<'a, RS: 'a + RootsStorage<H>, S: Storage<H>, H: Hasher> DrilldownIteratorEs
 					.ok_or_else(|| format!("Changes trie root for block {} is not found", block))?;
 
 				// only return extrinsics for blocks before self.max
-				// most of blocks will be filtered out beore pushing to `self.blocks`
+				// most of blocks will be filtered out before pushing to `self.blocks`
 				// here we just throwing away changes at digest blocks we're processing
 				debug_assert!(block >= self.begin, "We shall not touch digests earlier than a range' begin");
 				if block <= self.end.number {

substrate/core/state-machine/src/changes_trie/mod.rs

@@ -33,7 +33,7 @@
 //! to the set of lower-level digest blocks.
 //!
 //! Changes trie only contains the top level storage changes. Sub-level changes
-//! are propogated through its storage root on the top level storage.
+//! are propagated through its storage root on the top level storage.
 
 mod build;
 mod build_iterator;

substrate/core/state-machine/src/changes_trie/prune.rs

@@ -41,9 +41,9 @@ pub fn oldest_non_pruned_trie(
 	}
 }
 
-/// Prune obslete changes tries. Puning happens at the same block, where highest
+/// Prune obsolete changes tries. Pruning happens at the same block, where highest
 /// level digest is created. Pruning guarantees to save changes tries for last
-/// `min_blocks_to_keep` blocks. We only prune changes tries at `max_digest_iterval`
+/// `min_blocks_to_keep` blocks. We only prune changes tries at `max_digest_interval`
 /// ranges.
 /// Returns MemoryDB that contains all deleted changes tries nodes.
 pub fn prune<S: Storage<H>, H: Hasher, F: FnMut(H::Out)>(